What is the repetition rate of the sparks? On Fri, Apr 3, 2015 at 12:33 AM, Sean Breheny wrote: > Well, I'm not sure, but another possibility is that it is your eye, due t= o > the micro-movements your eye makes to form a complete image. If the > brightness of the spark varies as a function of time and is much faster > than the rate at which your eyes move, then it could be that sometimes yo= ur > eye is looking at one region during the brightest part of the spark and > sometimes it is looking at a different region. This may happen so fast th= at > persistence of vision causes it to appear as multiple brighter regions. > > > On Fri, Apr 3, 2015 at 12:25 AM, David VanHorn > wrote: > >> Room air. The source is a disruptive discharge coil. Current in a singl= e >> spark is more than an amp, very narrow pulses. Spherical electrodes. >> -- >> http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive >> View/change your membership options at >> http://mailman.mit.edu/mailman/listinfo/piclist >> > > --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .